The geochemistry and petrogenesis of basalts from the Taupo Volcanic Zone and Kermadec Island Arc, S.W. Pacific

Gamble, J. A.; Smith, I. E.; McCulloch, Malcolm T.; Graham, Ian; Kokelaar, B. P.

doi:10.1016/0377-0273(93)90067-2

Cited by 160 publications

(173 citation statements)

References 45 publications

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“…This observation has been corroborated by mass balance models developed for mantle compositions of distinct fertility (as expressed by Mg# and basaltic element contents) using the MELTS algorithm (Nguyen and Flower, 2004), and supports the contention that source fertility is a major, if not the dominant, control on HFSE abundances in mantle wedge regions (e.g. Duncan and Green, 1987;McCulloch and Gamble, 1991;Gamble et al, 1993;Woodhead et al, 1993Woodhead et al, , 2001.…”

Section: Implications Of Hfse Distributionsmentioning

confidence: 55%

Late Pliocene lamproites from Bucak, Isparta (southwestern Turkey): Implications for mantle ‘wedge’ evolution during Africa-Anatolian plate convergence

Çoban

Flower

2007

Journal of Asian Earth Sciences

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Section: Implications Of Hfse Distributionsmentioning

confidence: 55%

Late Pliocene lamproites from Bucak, Isparta (southwestern Turkey): Implications for mantle ‘wedge’ evolution during Africa-Anatolian plate convergence

Çoban

Flower

2007

Journal of Asian Earth Sciences

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“…Saunders et al 1980;Gamble et al 1993;Thirlwall et al 1994;Pearce and Peate 1995), which is considered to be attributable to re-fertilization of the mantle wedge by slabderived fluids (e.g. Gill 1981;Arculus and Powell 1986;Pearce and Parkinson 1993;Arculus 1994).…”

Section: Tectonomagmatic Evaluationmentioning

confidence: 99%

Geochemistry of mafic rocks of the Karakaya complex, Turkey: evidence for plume-involvement in the Palaeotethyan extensional regime during the Middle and Late Triassic

Sayıt

Göncüoğlu

2007

Int J Earth Sci (Geol Rundsch)

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The Karakaya Complex within the Early Mesozoic Cimmerian Orogeny in northern Turkey represents the remnants of the Palaeotethys. It includes slivers and/or mega-blocks of slightly metamorphic basic volcanic rocks associated with fossiliferous sediments as well as hypabyssal and intrusive rocks with basaltic-andesitic to ultramafic compositions. They display two distinct compositional groups; namely alkaline and variably tholeiitic. The alkaline basalt samples are more akin to oceanic-island basalts (OIB) with relatively enriched trace element characteristics together with strong partitioning in HREE ([La/Yb] N = 5.8-16.2), suggesting that garnet is present as a residual phase in the source of those basalts. The variably tholeiitic samples apart from diabases display E-MORB characteristics; being relatively depleted compared to the alkaline counterparts and less fractionated REE patterns ([La/Yb] N = 2.1-3.6). The diabases, on the other hand, are distinctively different with a significant negative Nb anomaly (Zr/Nb = 28.9-43.4) and flat REE patterns ([La/Yb] N = 0.8-1.4), suggesting their generation above a supra-subduction zone, probably a back-arc basin. These results may suggest that a mantle plume-related magmatism associated with extensional oceanic system should have been installed within Palaeotethys during MiddleLate Triassic time, which was then incorporated into subduction-accretion prism forming the final picture, that is, ''the Karakaya Complex''.

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“…The normalized patterns of the incompatible trace elements (Ta, Nb, Zr, Hf, Ti, Y) against average MORB, and low ratios of Ba/Nb (9-23) and Ba/Ta (130-327) suggest that the protolith was emplaced as ocean floor volcanics in a spreading boundary, such as a mid-oceanic ridge, and subsequently got metamorphosed during the Pan-African orogeny. Plots of Zr vs. HFSE such as Ti, Ce, and Hf, can also be discriminated between volcanic rocks such as low-K tholeiite (LKT), ocean floor basalts (OFB) and calc alkaline basalts (CAB) (Pearce and Cann, 1973;Gamble et al, 1993;Babaie et al, 2001). On the basis of the discriminant diagrams involving these elements, the ortho-amphibolites plot mainly in the field of Ocean Floor Basalts, though some plot on the boundaries of the fields of island-arc tholeiites and ocean floor basalts in Ti/100-Zr-Sr/2 variation diagram (Fig.…”

Section: Geotectonic Settingmentioning

confidence: 99%

Trace and rare-earth element geochemistry: A tool for petrogenetic and geotectonic modeling of ensimatic ortho-amphibolites from Pan-African belt of Obudu Plateau, Southeastern Nigeria

Ukaegbu

Beka

2009

Chin. J. Geochem.

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A model for the petrogenetic affinity and original geotectonic setting of ortho-amphibolites from the Obudu Plateau was tested using the distribution patterns of trace and rare-earth elements from the geochemical analyses of twelve representative amphibolite samples. Discrimination plots, normalized patterns of the incompatible trace elements against average MORB, low ratios of Ba/Nb (9-23) and Ba/Ta (130-327) and other geochemical characteristics suggest that the protoliths were dominantly of tholeiitic MORB composition. The values of the ratios of La/Ta (8.13-10.8), Rb/Sr (0.04-0.07), Th/U (mainly 4.43-5.43) and Hf/Ta (2.35-2.88) further indicate that the ortho-amphibolites demonstrate E-type MORB characteristics. These features are related to substantial ocean floor divergent tectonic boundary setting rather than marginal basin tectonic setting. This evolutionary pattern appears to be controlled by limited progressive partial melting and fractional crystallization of a single mantle source region, irrespective, however, of variations due to local source heterogeneities. The tholeiitic magmas were most probably generated by hotspot activities on the constructive plate margins and subsequently modified by subduction-related low-K tholeiitic chemistry due to narrowing of a proto oceanic basin between the West African craton and eastern Sahara plate. A likely model, therefore, is that the amphibolites of the Obudu Plateau represent ophiolitic suites with characteristics of enriched mid-ocean floor tholeiites, which were deformed and metamorphosed during a reversed plate motion involving subduction and collision within the Obudu Plateau in the Pan-African orogenic episode.

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The geochemistry and petrogenesis of basalts from the Taupo Volcanic Zone and Kermadec Island Arc, S.W. Pacific

Cited by 160 publications

References 45 publications

Late Pliocene lamproites from Bucak, Isparta (southwestern Turkey): Implications for mantle ‘wedge’ evolution during Africa-Anatolian plate convergence

Late Pliocene lamproites from Bucak, Isparta (southwestern Turkey): Implications for mantle ‘wedge’ evolution during Africa-Anatolian plate convergence

Geochemistry of mafic rocks of the Karakaya complex, Turkey: evidence for plume-involvement in the Palaeotethyan extensional regime during the Middle and Late Triassic

Trace and rare-earth element geochemistry: A tool for petrogenetic and geotectonic modeling of ensimatic ortho-amphibolites from Pan-African belt of Obudu Plateau, Southeastern Nigeria

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